--- _id: '2027' abstract: - lang: eng text: "\r\nMagnetic nanoparticles can be used for medical and other purposes, but can also be integrated in polymeric or other nonmagnetic matrices of diverse shapes, for example, thin-films or fibers. In the latter case, it may be important how the magnetic nanoparticles are distributed in the matrix, a topic which is often not taken into account when such composites are investigated experimentally or theoretically. Especially for small magnetic nanoparticles of dimensions allowing coherent reversal, the magnetic properties of such polymer/magnet composites can change drastically in the case of agglomerations. Here, a method is suggested to quantify the influence of nanoparticle distributions inside nonmagnetic matrices. By changing the average distance between nanoparticles of varying diameters between highly distributed particles and perfectly packed clusters, different magnetization dynamics can be modeled by micromagnetic simulations. Here, this process is shown for various magnetic materials and diameter distributions of magnetic nano-spheres and present corresponding micromagnetic simulation results, which underline the importance of taking into account possible magnetic agglomerations in nonmagnetic space." article_number: '2100381' article_type: original author: - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Jacek full_name: Grzybowski, Jacek last_name: Grzybowski - first_name: Andrea full_name: Ehrmann, Andrea id: '223776' last_name: Ehrmann orcid: 0000-0003-0695-3905 citation: alphadin: 'Blachowicz, Tomasz ; Grzybowski, Jacek ; Ehrmann, Andrea: Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration. In: Macromolecular Symposia Bd. 402, Wiley (2022), Nr. 1' ama: Blachowicz T, Grzybowski J, Ehrmann A. Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration. Macromolecular Symposia. 2022;402(1). doi:10.1002/masy.202100381 apa: Blachowicz, T., Grzybowski, J., & Ehrmann, A. (2022). Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration. Macromolecular Symposia, 402(1). https://doi.org/10.1002/masy.202100381 bibtex: '@article{Blachowicz_Grzybowski_Ehrmann_2022, title={Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration}, volume={402}, DOI={10.1002/masy.202100381}, number={12100381}, journal={Macromolecular Symposia}, publisher={Wiley}, author={Blachowicz, Tomasz and Grzybowski, Jacek and Ehrmann, Andrea}, year={2022} }' chicago: Blachowicz, Tomasz, Jacek Grzybowski, and Andrea Ehrmann. “Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration.” Macromolecular Symposia 402, no. 1 (2022). https://doi.org/10.1002/masy.202100381. ieee: T. Blachowicz, J. Grzybowski, and A. Ehrmann, “Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration,” Macromolecular Symposia, vol. 402, no. 1, 2022. mla: Blachowicz, Tomasz, et al. “Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration.” Macromolecular Symposia, vol. 402, no. 1, 2100381, Wiley, 2022, doi:10.1002/masy.202100381. short: T. Blachowicz, J. Grzybowski, A. Ehrmann, Macromolecular Symposia 402 (2022). date_created: 2022-07-14T17:46:15Z date_updated: 2024-03-27T14:01:14Z doi: 10.1002/masy.202100381 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2022-07-14T17:45:20Z date_updated: 2022-07-14T17:45:20Z file_id: '2028' file_name: _2022_Blachowicz_MacromolSymp402_2100381.pdf file_size: 3179355 relation: main_file success: 1 file_date_updated: 2022-07-14T17:45:20Z has_accepted_license: '1' intvolume: ' 402' issue: '1' keyword: - iron - collapse - cross-section - permalloy - spherical coordinates - virtual sphere language: - iso: eng oa: '1' publication: Macromolecular Symposia publication_identifier: eissn: - 1521-3900 issn: - 1022-1360 publication_status: published publisher: Wiley quality_controlled: '1' status: public title: Micromagnetic Simulations of Nanoparticles with Varying Amount of Agglomeration tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article urn: urn:nbn:de:hbz:bi10-20271 user_id: '216459' volume: 402 year: '2022' ... --- _id: '669' abstract: - lang: eng text: Magnetic vortices belong to the possibilities to store information in magnetic structures. Understanding their nucleation and propagation is also of interest in basic research. While vortices are usually examined in particles of homogeneous material, here we give an overview of the impact of borders between two materials, i.e. iron and permalloy, on magnetization reversal and vortex formation in double-wedges as well as adjacent rectangles of different thickness. While former investigations of pure iron nanoparticles of similar dimensions revealed different magnetization reversal magnetisms without vortex, with one or two vortices, the addition of a permalloy part stabilized the magnetization reversal so that in all situations under investigation, a single vortex was observed. Our simulations underline the technological importance of such double-material structures for the preparation of nanostructures for storage devices with reliable magnetization reversal processes, stable against erroneous modifications of nanoparticle dimensions and magnetic field orientations. article_number: '167294' article_type: original author: - first_name: Devika full_name: Sudsom, Devika last_name: Sudsom - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Lothar full_name: Hahn, Lothar last_name: Hahn - first_name: Andrea full_name: Ehrmann, Andrea id: '223776' last_name: Ehrmann orcid: 0000-0003-0695-3905 citation: alphadin: 'Sudsom, Devika ; Blachowicz, Tomasz ; Hahn, Lothar ; Ehrmann, Andrea: Vortex nucleation and propagation in magnetic double-wedges and semi-squares for reliable quaternary storage systems. In: Journal of Magnetism and Magnetic Materials Bd. 514 (2020)' ama: Sudsom D, Blachowicz T, Hahn L, Ehrmann A. Vortex nucleation and propagation in magnetic double-wedges and semi-squares for reliable quaternary storage systems. Journal of Magnetism and Magnetic Materials. 2020;514. doi:10.1016/j.jmmm.2020.167294 apa: Sudsom, D., Blachowicz, T., Hahn, L., & Ehrmann, A. (2020). Vortex nucleation and propagation in magnetic double-wedges and semi-squares for reliable quaternary storage systems. Journal of Magnetism and Magnetic Materials, 514. https://doi.org/10.1016/j.jmmm.2020.167294 bibtex: '@article{Sudsom_Blachowicz_Hahn_Ehrmann_2020, title={Vortex nucleation and propagation in magnetic double-wedges and semi-squares for reliable quaternary storage systems}, volume={514}, DOI={10.1016/j.jmmm.2020.167294}, number={167294}, journal={Journal of Magnetism and Magnetic Materials}, author={Sudsom, Devika and Blachowicz, Tomasz and Hahn, Lothar and Ehrmann, Andrea}, year={2020} }' chicago: Sudsom, Devika, Tomasz Blachowicz, Lothar Hahn, and Andrea Ehrmann. “Vortex Nucleation and Propagation in Magnetic Double-Wedges and Semi-Squares for Reliable Quaternary Storage Systems.” Journal of Magnetism and Magnetic Materials 514 (2020). https://doi.org/10.1016/j.jmmm.2020.167294. ieee: D. Sudsom, T. Blachowicz, L. Hahn, and A. Ehrmann, “Vortex nucleation and propagation in magnetic double-wedges and semi-squares for reliable quaternary storage systems,” Journal of Magnetism and Magnetic Materials, vol. 514, 2020. mla: Sudsom, Devika, et al. “Vortex Nucleation and Propagation in Magnetic Double-Wedges and Semi-Squares for Reliable Quaternary Storage Systems.” Journal of Magnetism and Magnetic Materials, vol. 514, 167294, 2020, doi:10.1016/j.jmmm.2020.167294. short: D. Sudsom, T. Blachowicz, L. Hahn, A. Ehrmann, Journal of Magnetism and Magnetic Materials 514 (2020). date_created: 2021-01-03T16:51:38Z date_updated: 2021-05-21T07:09:59Z department: - _id: '103' doi: 10.1016/j.jmmm.2020.167294 intvolume: ' 514' keyword: - Magnetic nanostructures - Wedges - Micromagnetic simulation - Vortex - Magnetization reversal - Iron - Permalloy - Lithography language: - iso: eng publication: Journal of Magnetism and Magnetic Materials publication_identifier: issn: - 0304-8853 publication_status: published quality_controlled: '1' status: public title: Vortex nucleation and propagation in magnetic double-wedges and semi-squares for reliable quaternary storage systems type: journal_article user_id: '237837' volume: 514 year: '2020' ... --- _id: '635' abstract: - lang: eng text: Magnetic vortex structures are of high technological relevance due to their possible application in magnetic memory. Moreover, investigating magnetization reversal via vortex formation is an important topic in basic research. Typically, such vortices are only investigated in homogeneous magnetic materials of diverse shapes. Here, we report for the first time on micromagnetic simulation of vortex formation in magnetic bow-tie nanostructures, comprising alternating parts from iron and permalloy, investigated for two different thicknesses and under different angles of the external magnetic field. While no vortex was found in pure permalloy square, nanoparticles of the dimensions investigated in this study and in case of iron only a relatively thick sample allowed for vortex formation, different numbers of vortices and antivortices were found in the bow-tie structures prepared from both materials, depending on the angular field orientation and the sample thickness. By stabilizing more than one vortex in a confined nanostructure, it is possible to store more than one bit of information in it. Our micromagnetic simulations reveal that such bi-material structures are highly relevant not only for basic research, but also for data storage applications. article_number: '5' article_type: original author: - first_name: Devika full_name: Sudsom, Devika last_name: Sudsom - first_name: Irén full_name: Juhász Junger, Irén last_name: Juhász Junger - first_name: Christoph full_name: Döpke, Christoph last_name: Döpke - first_name: Tomasz full_name: Blachowicz, Tomasz last_name: Blachowicz - first_name: Lothar full_name: Hahn, Lothar last_name: Hahn - first_name: Andrea full_name: Ehrmann, Andrea id: '223776' last_name: Ehrmann orcid: 0000-0003-0695-3905 citation: alphadin: 'Sudsom, Devika ; Juhász Junger, Irén ; Döpke, Christoph ; Blachowicz, Tomasz ; Hahn, Lothar ; Ehrmann, Andrea: Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures. In: Condensed Matter Bd. 5 (2020), Nr. 1' ama: Sudsom D, Juhász Junger I, Döpke C, Blachowicz T, Hahn L, Ehrmann A. Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures. Condensed Matter. 2020;5(1). doi:10.3390/condmat5010005 apa: Sudsom, D., Juhász Junger, I., Döpke, C., Blachowicz, T., Hahn, L., & Ehrmann, A. (2020). Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures. Condensed Matter, 5(1). https://doi.org/10.3390/condmat5010005 bibtex: '@article{Sudsom_Juhász Junger_Döpke_Blachowicz_Hahn_Ehrmann_2020, title={Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures}, volume={5}, DOI={10.3390/condmat5010005}, number={15}, journal={Condensed Matter}, author={Sudsom, Devika and Juhász Junger, Irén and Döpke, Christoph and Blachowicz, Tomasz and Hahn, Lothar and Ehrmann, Andrea}, year={2020} }' chicago: Sudsom, Devika, Irén Juhász Junger, Christoph Döpke, Tomasz Blachowicz, Lothar Hahn, and Andrea Ehrmann. “Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures.” Condensed Matter 5, no. 1 (2020). https://doi.org/10.3390/condmat5010005. ieee: D. Sudsom, I. Juhász Junger, C. Döpke, T. Blachowicz, L. Hahn, and A. Ehrmann, “Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures,” Condensed Matter, vol. 5, no. 1, 2020. mla: Sudsom, Devika, et al. “Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures.” Condensed Matter, vol. 5, no. 1, 5, 2020, doi:10.3390/condmat5010005. short: D. Sudsom, I. Juhász Junger, C. Döpke, T. Blachowicz, L. Hahn, A. Ehrmann, Condensed Matter 5 (2020). date_created: 2021-01-03T14:42:18Z date_updated: 2021-05-19T14:01:34Z ddc: - '530' department: - _id: '103' doi: 10.3390/condmat5010005 file: - access_level: open_access content_type: application/pdf creator: aehrmann date_created: 2021-01-03T14:41:31Z date_updated: 2021-01-03T14:41:31Z file_id: '636' file_name: _2020_Sudsom_CondMatter5_5_corr.pdf file_size: 4886370 relation: main_file success: 1 file_date_updated: 2021-01-03T14:41:31Z funded_apc: '1' has_accepted_license: '1' intvolume: ' 5' issue: '1' keyword: - magnetic nanostructures - micromagnetic simulation - bow-tie structure - vortex - magnetization reversal - iron - permalloy - lithography language: - iso: eng oa: '1' publication: Condensed Matter publication_identifier: issn: - 2410-3896 publication_status: published quality_controlled: '1' status: public title: Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures type: journal_article user_id: '237837' volume: 5 year: '2020' ...